Make a copy of a list with thelist()method: thislist = ["apple","banana","cherry"] mylist=list(thislist) print(mylist) Try it Yourself » Use the slice Operator You can also make a copy of a list by using the:(slice) operator. ...
x = copy.copy(y) # make a shallow copy of y 浅拷贝,只拷贝父对象, 不拷贝父对象里的子对象 x = copy.deepcopy(y) # make a deep copy of y深拷贝,递归拷贝,拷贝对象及其子对象 For module specific errors, copy.Error is raised. The difference between shallow and deep copying is only releva...
Let's say we have a List of Lists. If we make a copy with one of the above methods and change the inner elements, it still affects the other List as well: a=[[1,2],[3,4]]b=a[:]# or:# b = a.copy()# b = list(a)# b = copy.copy(a)b[0].append(99)print(b)# [...
copy(mcbShelf[sys.argv[1]]) # ➌ mcbShelf.close() 如果只有一个命令行参数,首先让我们检查它是否是'list'➊。如果是这样,架子钥匙列表的字符串表示将被复制到剪贴板 ➋。用户可以将该列表粘贴到打开的文本编辑器中进行阅读。 否则,您可以假设命令行参数是一个关键字。如果这个关键字作为一个键存在于...
# Multi-Worker setting.#TODO(omalleyt):Makethisattrpubliconce solution is stable.self._chief_worker_only=None self._supports_tf_logs=False defset_params(self,params):self.params=params defset_model(self,model):self.model=model @doc_controls.for_subclass_implementers ...
In other words, we created two separate lists, but each list stores the same exact references. Modifying a reference in one list modifies it in the other list.A deep copy method would make sure to copy both the outer list and the inner list. Keep that in mind as we move forward....
(x,"__reduce__",None)ifreductor:rv=reductor()else:raiseError("un(deep)copyable object of type%s"%cls)ifisinstance(rv,str):y=xelse:y=_reconstruct(x,memo,*rv)# If is its own copy, don't memoize.ifyisnotx:memo[d]=y_keep_alive(x,memo)# Make sure x lives at least as long as...
cmakelist生成python可调用的动态库 cmakelist编写,一、使用方法 一般把CMakeLists.txt文件放在工程目录下,使用时,先创建一个叫build的文件夹(这个并非必须,只是生成的Makefile等文件放在build里比较整齐),然后执行下列操作: cdbuild cmake.. m
stdout= chan.makefile("r", bufsize) stderr= chan.makefile_stderr("r", bufsize)returnstdin, stdout, stderr 1、参数说明: command(str类型),执行的命令串; bufsize(int类型),文件缓冲区大小,默认为-1(不限制) 2、使用exec_command()方法执行命令会返回三个信息: ...
="polygon":raiseShapeError# Get the new field name and validate itfieldname=arcpy.GetParameterAsText(1)fieldname=arcpy.ValidateFieldName(fieldname,os.path.dirname(input))# Make sure shape_length and shape_area fields existiflen(arcpy.ListFields(input,"Shape_area"))>0and\len(arcpy.ListFields(...